Head to head
Ifor Williams HB403 vs Richardson Trailers Supreme Treble
The Richardson Trailers Supreme Treble is rated 1.1 tonnes heavier gross. The Ifor Williams HB403 is 493kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Richardson Trailers Supreme Treble is rated 1.1 tonnes heavier gross.
- Unladen weight: the Richardson Trailers Supreme Treble weighs 493kg more empty.
Specifications side by side
| Ifor Williams HB403 | Richardson Trailers Supreme Treble | |
|---|---|---|
| Gross weight | 1600kg | 2,700kg |
| Unladen weight | 767kg | 1,260kg |
| Payload | 833kg | - |
| Internal length | 3.08m | - |
| Internal width | 1.30m | - |
| Capacity | - | 2 horses forward, 1 pony reversed |
| External dimensions | - | 5.40m long x 2.29m wide x 2.75m high |
| Internal dimensions | - | 3.54m long x 1.80m wide x 2.33m high |
Sources: Ifor Williams HB403, Richardson Trailers Supreme Treble. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB403 if...
- you want one that is 493kg lighter empty
The smallest trailer in the HB horsebox range, bought by owners of a single horse or a couple of ponies who want the lightest legal option that can still be towed by a mid-size car.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Buy or hire the Supreme Treble if...
- you want one that is rated 1.1 tonnes heavier gross
A three-berth Richardson trailer built for a household with two horses and a pony rather than a full string. The reversed pony bay keeps overall length down compared with three forward-facing berths, which suits smaller yards and tow vehicles.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
Common questions
What is the difference between the Ifor Williams HB403 and the Richardson Trailers Supreme Treble?
The Richardson Trailers Supreme Treble is rated 1.1 tonnes heavier gross. The Ifor Williams HB403 is 493kg lighter empty. The Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer; the Richardson Trailers Supreme Treble is a trailer for two horses and a pony, one forward one reversed.
Which is lighter, the Ifor Williams HB403 or the Richardson Trailers Supreme Treble?
The Ifor Williams HB403. It is 493kg lighter empty than the Richardson Trailers Supreme Treble.
Can I tow the Ifor Williams HB403 or the Richardson Trailers Supreme Treble on a car licence?
Yes, as far as the licence goes. Both are rated at or under 3,500kg gross, and a car (B) licence has covered towing up to 3,500kg since 16 December 2021. Your car still has to be rated to tow the loaded weight - check the handbook or the VIN plate.
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